1: #!/usr/bin/perl
2: # The LearningOnline Network with CAPA
3: #
4: # lonManage supports remote management of nodes in a LonCAPA cluster.
5: #
6: # $Id: lonManage,v 1.20 2003/11/03 10:24:49 foxr Exp $
7: #
8: # $Id: lonManage,v 1.20 2003/11/03 10:24:49 foxr Exp $
9: #
10: # Copyright Michigan State University Board of Trustees
11: #
12: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
13: ## LON-CAPA is free software; you can redistribute it and/or modify
14: # it under the terms of the GNU General Public License as published by
15: # the Free Software Foundation; either version 2 of the License, or
16: # (at your option) any later version.
17: #
18: # LON-CAPA is distributed in the hope that it will be useful,
19: # but WITHOUT ANY WARRANTY; without even the implied warranty of
20: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21: # GNU General Public License for more details.
22: #
23: # You should have received a copy of the GNU General Public License
24: # along with LON-CAPA; if not, write to the Free Software
25: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26: #
27: # /home/httpd/html/adm/gpl.txt
28: #
29: # http://www.lon-capa.org/
30: #
31: #
32: # lonManage supports management of remot nodes in a lonCAPA cluster.
33: # it is a command line tool. The following command line syntax (usage)
34: # is supported:
35: #
36: # lonManage -push <tablename> newfile [host]
37: # Push <tablename> to the lonTabs directory. Note that
38: # <tablename> must be one of:
39: # host (hosts.tab)
40: # domain (domain.tab)
41: #
42: # lonManage -reinit lonc [host]
43: # Sends a HUP signal to the remote systems's lond.
44: #
45: # lonmanage -reinit lond [host]
46: # Requests the remote system's lond perform the same action as if
47: # it had received a HUP signal.
48: #
49: # In the above syntax, the host above is the hosts.tab name of a host,
50: # not the IP address of the host
51: #
52: # If [host] is not supplied, every host in the client's hosts.tab
53: # table is iterated through and procesed..
54: #
55: #
56:
57:
58:
59: # Modules required:
60:
61: use lib ".";
62:
63: use strict; # Because it's good practice.
64: use English; # Cause I like meaningful names.
65: use Getopt::Long;
66: use IO::Socket::UNIX; # To communicate with lonc.
67: use LondConnection;
68:
69: # File scoped variables:
70:
71: my %perlvar; # Perl variable defs from apache config.
72: my %hostshash; # Host table as a host indexed hash.
73:
74: my $MyHost=""; # Host name to use as me.
75: my $ForeignHostTab=""; # Name of foreign hosts table.
76:
77: #
78: # prints out utility's command usage info.
79: #
80: sub Usage {
81: print "Usage:";
82: print <<USAGE;
83: lonManage [--myname=host --hosts=table] --push=<tablename> newfile [host]
84: Push <tablename> to the lonTabs directory. Note that
85: <tablename> must be one of:
86: host (hosts.tab)
87: domain (domain.tab)
88:
89: lonManage [--myname=host --hosts=table] --reinit=lonc [host]
90: Causes lonc in the remote system to reread hosts.tab and
91: adjust the set of clients that are being maintained to match
92: the new file.
93:
94:
95: lonManage [--myname=host --hosts=table] --reinit=lond [host]
96: Causes lond in the remote system to reread the hosts.tab file
97: and adjust the set of servers to match changes in that file.
98:
99: In the above syntax, the host above is the hosts.tab name of a host,
100: not the IP address of the host.
101:
102: If [host] is omitted, all hosts in the hosts.tab file are iterated
103: over.
104:
105: For all of the above syntaxes if --myname=host and --hosts=table are
106: supplied (both must be present), the utility runs in standalone mode
107: presenting itself to the world as 'host' and using the hosts.tab file
108: specified in the --hosts switch.
109: USAGE
110:
111:
112: }
113: #
114: # Lifted from lonnet.pm - and we need to figure out a way to get it back in.
115: # Performas a transaction with lond via the lonc proxy server.
116: # Parameter:
117: # cmd - The text of the request.
118: # host - The host to which the request ultimately goes.
119: # Returns:
120: # The text of the reply from the lond or con_lost if not able to contact
121: # lond/lonc etc.
122: #
123: sub subreply {
124: my ($cmd,$server)=@_;
125: my $peerfile="$perlvar{'lonSockDir'}/$server";
126: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
127: Type => SOCK_STREAM,
128: Timeout => 10)
129: or return "con_lost";
130: print $client "$cmd\n";
131: my $answer=<$client>;
132: if (!$answer) { $answer="con_lost"; }
133: chomp($answer);
134: return $answer;
135: }
136: # >>> BUGBUG <<<
137: #
138: # Use Getopt::Long to parse the parameters of the program.
139: #
140: # Return value is a list consisting of:
141: # A 'command' which is one of:
142: # push - table push requested.
143: # reinit - reinit requested.
144: # Additional parameters as follows:
145: # for push: Tablename, hostname
146: # for reinit: Appname hostname
147: #
148: # This function does not validation of the parameters of push and
149: # reinit.
150: #
151: # returns a list. The first element of the list is the operation name
152: # (e.g. reinit or push). The second element is the switch parameter.
153: # for push, this is the table name, for reinit, this is the process name.
154: # Additional elements of the list are the command argument. The count of
155: # command arguments is validated, but not their semantics.
156: #
157: # returns an empty list if the parse fails.
158: #
159:
160:
161: sub ParseArgs {
162: my $pushing = '';
163: my $reinitting = '';
164:
165: if(!GetOptions('push=s' => \$pushing,
166: 'reinit=s' => \$reinitting,
167: 'myname=s' => \$MyHost,
168: 'hosts=s' => \$ForeignHostTab)) {
169: return ();
170: }
171: # The --myname and --hosts switch must have values and
172: # most both appear if either appears:
173:
174: if(($MyHost ne "") && ($ForeignHostTab eq "")) {
175: return ();
176: }
177: if(($ForeignHostTab ne "") && ($MyHost eq "")) {
178: return ();
179: }
180:
181: # Require exactly one of --push and --reinit
182:
183: my $command = '';
184: my $commandarg = '';
185: my $paramcount = @ARGV; # Number of additional arguments.
186:
187:
188: if($pushing ne '') {
189:
190: # --push takes in addition a table, and an optional host:
191: #
192: if(($paramcount != 2) && ($paramcount != 1)) {
193: return (); # Invalid parameter count.
194: }
195: if($command ne '') {
196: return ();
197: } else {
198:
199: $command = 'push';
200: $commandarg = $pushing;
201: }
202: }
203:
204: if ($reinitting ne '') {
205:
206: # --reinit takes in addition just an optional host name
207:
208: if($paramcount > 1) {
209: return ();
210: }
211: if($command ne '') {
212: return ();
213: } else {
214: $command = 'reinit';
215: $commandarg = $reinitting;
216: }
217: }
218:
219: # Build the result list:
220:
221: my @result = ($command, $commandarg);
222: my $i;
223: for($i = 0; $i < $paramcount; $i++) {
224: push(@result, $ARGV[$i]);
225: }
226:
227: return @result;
228: }
229: #
230: # Read the loncapa configuration stuff. If ForeignHostTab is empty,
231: # assume we are part of a loncapa cluster and read the hosts.tab
232: # file from the config directory. Otherwise, ForeignHossTab
233: # is the name of an alternate configuration file to read in
234: # standalone mode.
235: #
236: sub ReadConfig {
237:
238: if($ForeignHostTab eq "") {
239: my $perlvarref = LondConnection::read_conf('loncapa.conf');
240: %perlvar = %{$perlvarref};
241: my $hoststab = LondConnection::read_hosts(
242: "$perlvar{'lonTabDir'}/hosts.tab");
243: %hostshash = %{$hoststab};
244: $MyHost = $perlvar{lonHostID}; # Set hostname from vars.
245: } else {
246: my $hoststab = LondConnection::read_hosts($ForeignHostTab);
247: %hostshash = %{$hoststab};
248: $perlvar{londPort} = 5663;
249: $perlvar{lonSockDir} = "/home/httpd/sockets";
250: }
251:
252: }
253: #
254: # Determine if the target host is valid.
255: # This is done by reading the current hosts.tab file.
256: # For the host to be valid, it must be inthe file.
257: #
258: # Parameters:
259: # host - Name of host to check on.
260: # Returns:
261: # true if host is valid.
262: # false if host is invalid.
263: #
264: sub ValidHost {
265: my $host = shift;
266:
267:
268: return defined $hostshash{$host};
269:
270: }
271:
272:
273:
274: #
275: # Performs a transaction with lonc.
276: # By the time this is called, the transaction has already been
277: # validated by the caller.
278: #
279: # Parameters:
280: #
281: # host - hosts.tab name of the host whose lonc we'll be talking to.
282: # command - The base command we'll be asking lond to execute.
283: # body - [optional] If supplied, this is a command body that is a ref.
284: # to an array of lines that will be appended to the
285: # command.
286: #
287: # NOTE:
288: # The command will be done as an encrypted operation.
289: #
290: sub Transact {
291: my $host = shift;
292: my $command = shift;
293: my $haveBody= 0;
294: my $body;
295: my $i;
296:
297: if(scalar @ARG) {
298: $body = shift;
299: $haveBody = 1;
300: }
301: # Construct the command to send to the server:
302:
303: my $request = "encrypt\:"; # All requests are encrypted.
304: $request .= $command;
305: if($haveBody) {
306: $request .= "\:";
307: my $bodylines = scalar @$body;
308: for($i = 0; $i < $bodylines; $i++) {
309: $request .= $$body[$i];
310: }
311: } else {
312: $request .= "\n";
313: }
314: # Body is now built... transact with lond..
315:
316: my $answer = subreply($request, $host);
317:
318: print "$answer\n";
319:
320: }
321: #
322: # Called to push a file to the remote system.
323: # The only legal files to push are hosts.tab and domain.tab.
324: # Security is somewhat improved by
325: #
326: # - Requiring the user run as root.
327: # - Connecting with lonc rather than lond directly ensuring this is a loncapa
328: # host
329: # - We must appear in the remote host's hosts.tab file.
330: # - The host must appear in our hosts.tab file.
331: #
332: # Parameters:
333: # tablename - must be one of hosts or domain.
334: # tablefile - name of the file containing the table to push.
335: # host - name of the host to push this file to.
336: #
337: # >>>BUGBUG<<< This belongs in lonnet.pm.
338: #
339: sub PushFile {
340: my $tablename = shift;
341: my $tablefile = shift;
342: my $host = shift;
343:
344: # Open the table file:
345:
346: if(!open(TABLEFILE, "<$tablefile")) {
347: die "ENOENT - No such file or directory $tablefile";
348: }
349:
350: # Require that the host be valid:
351:
352: if(!ValidHost($host)) {
353: die "EHOSTINVAL - Invalid host $host"; # Ok so I invented this 'errno'.
354: }
355: # Read in the file. If the table name is valid, push it.
356:
357: my @table = <TABLEFILE>; # These files are pretty small.
358: close TABLEFILE;
359:
360: if( ($tablename eq "host") ||
361: ($tablename eq "domain")) {
362: print("Pushing $tablename to $host\n");
363: Transact($host, "pushfile:$tablename",\@table);
364: } else {
365: die "EINVAL - Invalid parameter. tablename: $tablename must be host or domain";
366: }
367: }
368: #
369: # This function is called to reinitialize a server in a remote host.
370: # The servers that can be reinitialized are:
371: # - lonc - The lonc client process.
372: # - lond - The lond daemon.
373: # NOTE:
374: # Reinitialization in this case means re-scanning the hosts table,
375: # starting new lond/lonc's as approprate and stopping existing lonc/lond's.
376: #
377: # Parameters:
378: # process - The name of the process to reinit (lonc or lond).
379: # host - The host in which this reinit will happen.
380: #
381: # >>>BUGBUG<<<< This belongs in lonnet.pm
382: #
383: sub ReinitProcess {
384: my $process = shift;
385: my $host = shift;
386:
387: # Ensure the host is valid:
388:
389: if(!ValidHost($host)) {
390: die "EHOSTINVAL - Invalid host $host";
391: }
392: # Ensure target process selector is valid:
393:
394: if(($process eq "lonc") ||
395: ($process eq "lond")) {
396: print("Reinitializing $process in $host\n");
397: Transact($host, "reinit:$process");
398: } else {
399: die "EINVAL -Invalid parameter. Process $process must be lonc or lond";
400: }
401: }
402: #--------------------------- Entry point: --------------------------
403:
404:
405:
406: # Parse the parameters
407: # If command parsing failed, then print usage:
408:
409: my @params = ParseArgs;
410: my $nparam = @params;
411:
412: if($nparam == 0) {
413: Usage;
414: exit -1;
415: }
416: #
417: # Next, ensure we are running as EID root.
418: #
419: if ($EUID != 0) {
420: die "ENOPRIV - No privilege for requested operation"
421: }
422:
423: #
424: # Read the configuration file.
425: #
426:
427: ReadConfig; # Read the configuration info (incl.hosts).
428:
429: # Based on the operation requested invoke the appropriate function:
430:
431: my $operation = shift @params;
432:
433: if($operation eq "push") { # push tablename filename host
434: my $tablename = shift @params;
435: my $tablefile = shift @params;
436: my $host = shift @params;
437: if($host) {
438: PushFile($tablename, $tablefile, $host);
439: } else { # Push to whole cluster.
440: foreach my $host (keys %hostshash) {
441: PushFile($tablename, $tablefile, $host);
442: }
443: }
444:
445: } elsif($operation eq "reinit") { # reinit processname host.
446: my $process = shift @params;
447: my $host = shift @params;
448: if ($host) {
449: ReinitProcess($process, $host);
450: } else { # Reinit whole cluster.
451: foreach my $host (keys %hostshash) {
452: ReinitProcess($process,$host);
453: }
454: }
455: }
456: else {
457: Usage;
458: }
459: exit 0;
460:
461: =head1 NAME
462: lonManage - Command line utility for remote management of lonCAPA
463: cluster nodes.
464:
465: =head1 SYNOPSIS
466:
467: Usage:
468: B<lonManage --push=<tablename> newfile host>
469: Push <tablename> to the lonTabs directory. Note that
470: <tablename> must be one of:
471: hosts (hosts.tab)
472: domain (domain.tab)
473:
474: B<lonManage --reinit=lonc host>
475: Sends a HUP signal to the remote systems's lond.
476:
477: B<lonmanage --reinit=lond host>
478: Requests the remote system's lond perform the same action as if
479: it had received a HUP signal.
480:
481: In the above syntax, the host above is the hosts.tab name of a host,
482: not the IP address of the host.
483:
484:
485: =head1 DESCRIPTION
486:
487: =head1 PREREQUISITES
488:
489: =item strict
490: =item Getopt::Long
491: =item English
492: =item IO::Socket::UNIX
493:
494: =head1 KEY Subroutines.
495:
496: =head1 CATEGORIES
497: Command line utility
498:
499: =cut
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